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We have a terrace of 25 m² tiled. For some time there has been a milky acid product from under the tiling that attacks the concrete, the asphalt of the yard, the plaster and even the metal smooth around the terrace. The latter oxidizes and the product forms stalactites... where can it come from? how to treat it?

You do not specify if the terrace has been redone recently or if it is old and if the phenomenon is recent... If the joints were made with cement mortar and not with slip provided for this purpose, it is possible that the laitance that you see appear results from a deterioration of the joints and provokes what the specialists call a "carbonation", responsible for the phenomena of corrosion which you notice. The only solution would be to strip the joints (that is to say, to regroove them) and remake them with a suitable product.

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